/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "jni.h"
#include "jvmti.h"

#include <vector>

#include "jvmti_helper.h"
#include "test_env.h"

namespace art {
namespace common_suspension {

extern "C" JNIEXPORT jboolean JNICALL Java_art_Suspension_isSuspended(
    JNIEnv* env, jclass, jthread thr) {
  jint state;
  if (JvmtiErrorToException(env, jvmti_env, jvmti_env->GetThreadState(thr, &state))) {
    return false;
  }
  return (state & JVMTI_THREAD_STATE_SUSPENDED) != 0;
}

static std::vector<jthread> CopyToVector(JNIEnv* env, jobjectArray thrs) {
  jsize len = env->GetArrayLength(thrs);
  std::vector<jthread> ret;
  ret.reserve(len);
  for (jsize i = 0; i < len; i++) {
    ret.push_back(reinterpret_cast<jthread>(env->GetObjectArrayElement(thrs, i)));
  }
  return ret;
}

extern "C" JNIEXPORT jintArray JNICALL Java_art_Suspension_resumeList(JNIEnv* env,
                                                                      jclass,
                                                                      jobjectArray thr) {
  static_assert(sizeof(jvmtiError) == sizeof(jint), "cannot use jintArray as jvmtiError array");
  std::vector<jthread> threads(CopyToVector(env, thr));
  if (env->ExceptionCheck()) {
    return nullptr;
  }
  jintArray ret = env->NewIntArray(threads.size());
  if (env->ExceptionCheck()) {
    return nullptr;
  }
  jint* elems = env->GetIntArrayElements(ret, nullptr);
  JvmtiErrorToException(env, jvmti_env,
                        jvmti_env->ResumeThreadList(threads.size(),
                                                    threads.data(),
                                                    reinterpret_cast<jvmtiError*>(elems)));
  env->ReleaseIntArrayElements(ret, elems, 0);
  return ret;
}

extern "C" JNIEXPORT jintArray JNICALL Java_art_Suspension_suspendList(JNIEnv* env,
                                                                       jclass,
                                                                       jobjectArray thrs) {
  static_assert(sizeof(jvmtiError) == sizeof(jint), "cannot use jintArray as jvmtiError array");
  std::vector<jthread> threads(CopyToVector(env, thrs));
  if (env->ExceptionCheck()) {
    return nullptr;
  }
  jintArray ret = env->NewIntArray(threads.size());
  if (env->ExceptionCheck()) {
    return nullptr;
  }
  jint* elems = env->GetIntArrayElements(ret, nullptr);
  JvmtiErrorToException(env, jvmti_env,
                        jvmti_env->SuspendThreadList(threads.size(),
                                                     threads.data(),
                                                     reinterpret_cast<jvmtiError*>(elems)));
  env->ReleaseIntArrayElements(ret, elems, 0);
  return ret;
}

extern "C" JNIEXPORT void JNICALL Java_art_Suspension_resume(JNIEnv* env, jclass, jthread thr) {
  JvmtiErrorToException(env, jvmti_env, jvmti_env->ResumeThread(thr));
}

extern "C" JNIEXPORT void JNICALL Java_art_Suspension_suspend(JNIEnv* env, jclass, jthread thr) {
  JvmtiErrorToException(env, jvmti_env, jvmti_env->SuspendThread(thr));
}

}  // namespace common_suspension
}  // namespace art